The trend with all these things right now is piping [It was also popular last year, when J.Crew had their school boy blazer piped and I'm still kicking myself for not pulling the trigger]. Which is great because it's one of those tiny details that I can't get enough of. Almost like a tassel...can't get enough of those either. I found a lot of steals on these layers, so get started, or don't because you are smarter than me and waiting until you actually need these layers for good.
GAP Academy Blazer [15% off with code GAPGIFT]
Pim + Larkin Piper Blazer
C.Luce Pop Trim Blazer